Make n the subject of the formula: m = 5n - 21

The answer is: n = (m + 21)/5 How did we get this? Right now, the equation is written in the form where m is the subject. We want to rearrange this so that n is the subject of the formula. The formula should look like this: n = ___________________ So how do we do this? Step 1) We plus 21 to both sides of the equation. So the equation should now read m + 21 = 5n Step 2) Now we know that 5n = m + 21. We want to know what 1n equals so we have to divide both sides by 5. The equation is now 1n = (m + 21)/5 which is your answer. Does this make sense? If so, try the next questions! * Make R the subject of the formula:       S = 3r + 15 * Make y the subject of the formula:       X = 1/2 y + 20